github actions: Clean rinse cache

I'm honestly not sure why this is necessary now, but this ensures
that rinse is able to download and install the centos 7 rpms in
the build chroot

Author: bmastbergen

.github/workflows/build-check_x86_64.yml

@@ -23,6 +23,7 @@ jobs:
 
       - name: Build centos7 chroot
         run: |
+          sudo rinse --clean-cache
           sudo rinse --distribution centos-7 \
                 --mirror http://dl.rockylinux.org/vault/centos/7/os/x86_64/Packages \
                 --arch amd64 \